Work

An innovative method for mesoscale modelling of moisture diffusion in concrete

Year: 2024

Type: article

Abstract: Moisture diffusion influences the durability and long-term performance of concrete and whilst it predominantly occurs via the cement matrix and Interfacial Transition Zone , most existing models consider concrete to be homogeneous. This paper introduces a novel micro-meso model that employs random packing and Voronoi tessellation. Rayleigh-Ritz pore distribution and Brunauer-Skalny-Bodor models are combined to determine the radius and fraction of various pores. The results indicate that relative humidity diffuses faster with increasing temperature, decreasing ambient relative humidity and tortuosity. Ambient relative humidity has a greater influence on diffusion compared to temperature and tortuosity. Numerical and experimental comparisons demonstrate that the proposed methodology effectively captures relative humidity distribution across various scenarios. Furthermore, explicit pore network modelling incorporates key parameters for a more accurate analysis. Integrating the proposed methodology into a fully coupled hygro-mechanical framework can potentially yield more accurate predictions of mechanical behaviour ; enhancing the reliability of long-term performance assessments and enabling more durable concrete design.

Source: Cement and Concrete Composites

DOI: 10.1016/j.cemconcomp.2024.105836

Authors: Songsong Meng, Yifan Li, Iman Hajirasouliha, Giacomo Torelli, Maurizio Guadagnini, Kypros Pilakoutas

Institution: University of Sheffield

Language: English

Topic: Concrete Properties and Behavior

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,630

Funders: UK Research and Innovation, European Commission, Engineering and Physical Sciences Research Council